| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 58i - Glaciated Reading Prong | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 07871 - Sparta, NJ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 16 | 25 | 35 | 45 | 54 | 59 | 57 | 49 | 38 | 30 | 21 | 37 |
| Avg Max Temp (°F) | 35 | 37 | 47 | 58 | 69 | 77 | 82 | 80 | 73 | 62 | 51 | 39 | 59 |
| Avg Precip (In.) | 4.02 | 3.05 | 4.15 | 4.32 | 4.75 | 4.61 | 4.61 | 4.36 | 4.75 | 3.94 | 4.21 | 3.79 | 50.55 |